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A re-examination of the disk flow regulator
Bulletin of the World Health Organization
|January 1, 1971
Summary
Disk flow regulators ensure uniform insecticide application in malaria eradication programs. Swelling of the disk due to DDT formulation causes output reduction, but proper nozzle mating improves performance.
Area of Science:
- Public Health
- Entomology
- Chemical Engineering
Background:
- Uniform insecticide deposition is critical for malaria eradication residual spraying programs.
- Hand compression sprayers are commonly used, but achieving uniform application can be challenging.
- Disk flow regulators can enhance uniformity but have faced issues with field durability.
Purpose of the Study:
- To investigate the mode of action of disk flow regulators in insecticide spraying.
- To identify the cause of performance degradation in disk flow regulators during field use.
- To provide recommendations for optimizing the use of disk flow regulators for effective malaria control.
Main Methods:
- Analysis of disk swelling and its impact on flow rate.
- Evaluation of different nozzle tip types for compatibility with disk flow regulators.
- Field performance assessment of disk flow regulators with DDT formulations.
Main Results:
- Disk swelling, induced by DDT formulations, is the primary reason for reduced insecticide output over time.
- Proper mating of the disk with the nozzle tip is essential for consistent performance.
- The 9504E-type nozzle tip is identified as optimal for achieving desired spray output with disk flow regulators.
Conclusions:
- Disk flow regulators are recommended for malaria eradication programs due to their ability to ensure uniform spray application.
- Addressing disk swelling issues through proper component selection can improve the longevity and effectiveness of these devices.
- Optimized use of disk flow regulators can also lead to reduced nozzle-tip erosion, enhancing equipment lifespan.